KIMBA and districts residents have less than a week to have their say on the National Radioactive Waste Management Facility.
A postal ballot, requested by the Kimba community, will close on June 21, giving locals a chance to indicate whether or not they support either of the nominated sites at Napandee and Lyndhurst.
Should residents agree with one location, it would move into phase two.
The second phase will involve an in-depth technical analysis and detailed community consultation to understand if the site would be suitable for the national facility for Australian waste.
The site would be largely associated with nuclear medicine production.
Department of Industry, Innovation and Science resources head Bruce Wilson encouraged the community to get involved.
“We understand there are various perspectives on the project and now is the opportunity for people to let us know their view,” he said.
Postal ballots have already been sent to those eligible to vote, along with a reply paid envelope.
Meanwhile, Premier Jay Weatherill has ruled out constructing a state-run nuclear waste facility, declaring the proposal 'dead'.